Drag the numbers onto the grid so that the sum of the four numbers around a circle add up to the total given in the circle.
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Topics: Starter  Mental Methods  Problem Solving  Puzzles
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Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=August25 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a selfchecking, interactive version of this puzzle.
Suko and Sujiko were developed by Kobayaashi Studios and permission to use the idea here has been kindly granted by their syndication agents, Puzzler.com.
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